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Does anyone know what the limit on concurrent connections to mysql is?

I was reviewing the stats in phpmyadmin and saw that my databases have a maximum number of at least 100 concurrent connections, and on some it goes up to 1,400. These are for development sites where often I am the only person connecting. An average of 400 concurrent connections seems very high for such a situation where there might be a handful of pageviews per day.

Are the stats on this accurate for the database or do they represent the cluster as a whole?